[Gubi]

Uh, I don't think that necessarily follows, Paul. If the pump is failing and can't keep up with the flow @ pressure requirements the bowls are not going to stay full.

Regardless, Lokki, you're better off installing the new Facet anyway. They're good fuel pumps and those little cube ones are junk. If you're lucky like me the hole spacing on the mount is the same and you can fit it where the old fuel pump is (mine on the Giulia is in front of the fuel tank, passenger side, but no pics).

Fuel pressure is not adjustable at the pump. Different Facet models have different flow/pressure characteristics. Sounds like you have the same one I got which is 4-5PSI output pressure: tad high for Webers so use the inline regulator to dial it down to 3-3.5PSI.

The Facet has a 70um inlet filter (cleanable) so it doesn't need a filter from the tank. You should probably install a finer inline filter before the carbs just to be safe, though.

 

[Gubi]

I've got a Facet Gold-Flo from Centerline mounted in that manner: it's in the old SPICA pump position with a top-draw tank. With twin carbs it's been working fine for me without an in-tank pump.

The Gold-Flo is self priming, and this model also has an internal anti-siphon valve. This closes when the pump shuts off and prevents the fuel draining back into the tank, which means the pump doesn't need to prime from dry every time you start the car.

 

[Gubi]

So the sending unit I have is aftermarket, and has a metal tube to the bottom of the tank. There is a zip-tied plastic screen on the intake. If you're looking for something to replace the in-tank pump I do not believe standard rubber fuel hose will work as it is not designed to be submerged in gasoline. You could likely braze on a metal tube to extend your sender to the bottom of the tank, or of course just buy a new sender.

You don't really need a filter before the pump, the Facet has a built-in 70um cleanable screen. I have a Filter King right before the carbs to serve as a fine filter and pressure regulator.

 

[Gubi]

No, it should be mounted vertically, with the removable filter at the bottom.

Here is my install in the 1974 GTV. I got some rubber isolators (M6x1, I think?) that screwed into the existing fuel pump holes. I then made a short steel bridge to match the mounting distance of the facet pump. The Facet is grounded to body via a short wire installed across the rubber insulator.

 

[Gubi]

From the diagrams on their web page it looks like they're 1/8-27 NPT.

If you're going to go through the trouble of installing the Facet there's no need to keep the mechanical pump. It's just extra complication at that point, and I would suggest just bypassing it and running off the Facet.